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This is a rant against marketing hype run amok.
Seems I'm always getting a flat tire on one vehicle or another, and waiting on a slow 12v air compressor. When you go to buy a portable compressor, you read impressive PSI output: "250 PSI!" and even "Produces a fantastic 300 PSI!". Well, maybe they
will actually produce those stratospheric and dangerous pressures. But why? This is always at the expense of VOLUME, which is much more useful. Why not make a truly useful portable compressor. Make one with a man-sized piston instead of a thimble sized piston. Trade PSI for volume. Match the piston and motor to produce 35 PSI at the highest possible volume without drawing excessively high amps. Why wait 10 minutes in the freezing cold for a tiny piston to fill your tire when a bigger piston pump may only take 30-45 seconds? It all went wrong when these little compressors first came out. The manufacturer used PSI as the measuring stick instead of CFM (cubic feet per minute) as they should have. The poor average schmuck keeps on choosing the higher pressure pumps, and the crummy slow pumps are perpetuated.
A faster alternative
http://www.air-up.com/4wd.html
Better than your shop compressor at home... [Custardguts, Nov 22 2007]
[link]
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Cool, you could use it to explode people. |
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//Why 35 PSI? I need 40+, even 50.// |
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Then use a high pressure pump. They're fine fir bike tires. |
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//Though I certainly sympathize with your position, a compressor with a "man-sized" // |
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I don't think replacing a 1" piston with a 2" piston (for example) would take up significantly more room. However, it will put out 4X the volume at a given stroke and RPM. |
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Jeeze, I know that bike tires need from 45-80 PSI, but I've never heard of an automobile tire that takes over 32PSI. Even going from a 250 psi pump to a 50 PSI pump could increase the volume by a great amount. |
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Rating on portable compressors are on the order of .1 CFM. (they're usually hidden) Even a .5 HP motor pulling 30a could probably get you over 1 CFM. It's very do-able. There's no demand because consumers think astronomically high pressure is the holy grail. |
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I've looked high and low for a faster pump. I simply can not fine one. |
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Oh well, no big deal. I just like to peck away at life's little annoyances. |
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Road tires on racing bicycles can sometimes handle in excess of 100 PSI, but I've never heard of anything running in the 250 range. |
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I really don't think these
compressor makers are
responding to consumer demand
and driving up the pressure. They
are making them as cheap as they
possibly can, and scrounging
around for any big sounding spec
they can find to put in big type on
the front. Those tiny compressors
are designed to be good gifts, not
to be good inflators. Throw it out.
Buy one of those spray can style
one time tire inflators (they just
take about 30 seconds) and then
drive home to where you keep
your really nice shop compressor
(or to the gas station) and finish
the job properly. And while you're
out getting the fix a flat can, stop
off and get a new set of tires that
don't leak so much. |
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Use a foot-pump. Inflate tyre moderately quickly *and* keep warm. |
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I feel kind of perplexed to find out that the halfbakery has a 'halfbakery: category' category for non-inventions. What exactly does that mean to a site mostly devoted to inventions? |
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Is there a 'halfbakery: non-category: invention' category? |
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[rayford] By looking at the other entries in this category. It seems as though this is a category for the creation of new categories which have other material rather than inventions.
This would probably be better suited to a different category (like car:tire), rather than one about the creation of categories. |
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See [linky] for the fastest method. |
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